Статья

Dual-Frequency VSOP Observations of AO 0235+164

S. FreyLeonid Gurvits2Joint Institute for VLBI in Europe, P.O. Box 2, 7990 AA Dwingeloo, The NetherlandsDaniel R. Altschuler3National Astronomy and Ionosphere Center, Arecibo Observatory, P.O. Box 995, Arecibo, Puerto Rico 00613M. M. Davis3National Astronomy and Ionosphere Center, Arecibo Observatory, P.O. Box 995, Arecibo, Puerto Rico 00613Phil Perillat3National Astronomy and Ionosphere Center, Arecibo Observatory, P.O. Box 995, Arecibo, Puerto Rico 00613C. J. Salter3National Astronomy and Ionosphere Center, Arecibo Observatory, P.O. Box 995, Arecibo, Puerto Rico 00613H. D. Aller4Astronomy Department, University of Michigan, Ann Arbor, MI 48109, USAM. F. Aller4Astronomy Department, University of Michigan, Ann Arbor, MI 48109, USAH. Hirabayashi5The Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510

2000en

ABI

Аннотация

Abstract AO 0235+164 is a very compact, flat spectrum radio source identified as a BL Lac object at a redshift of z = 0.94. It is one of the most violently variable extragalactic objects at both optical and radio wavelengths. The radio structure of the source revealed by various ground-based VLBI observations is dominated by a nearly unresolved compact component at almost all available frequencies. Dual-frequency space VLBI observations of AO 0235+164 were made with the VSOP mission in 1999 January-February. The array of the Japanese HALCA satellite and co-observing ground radio telescopes in Australia, Japan, China, and South Africa allowed us to study AO 0235+164 with an unprecedented angular resolution at frequencies of 1.6 and 5 GHz. We report on the sub-milliarcsecond structural properties of the source. The 5-GHz observations led to an estimate of TB&gt;5.8×1013 K for the rest-frame brightness temperature of the core, which is the highest value measured with VSOP to date.

Перевод пока недоступен

Идентификаторы

DOI: 10.1093/pasj/52.6.975

Цитирования и источники

Цитирований: 2Использованных источников: 0

Показатели — AkademScholar